EP2832439A1 - Réacteur pour la production des granulés d'engrais contenant d'azote - Google Patents

Réacteur pour la production des granulés d'engrais contenant d'azote Download PDF

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Publication number
EP2832439A1
EP2832439A1 EP13178904.2A EP13178904A EP2832439A1 EP 2832439 A1 EP2832439 A1 EP 2832439A1 EP 13178904 A EP13178904 A EP 13178904A EP 2832439 A1 EP2832439 A1 EP 2832439A1
Authority
EP
European Patent Office
Prior art keywords
reactor
process according
urea
organic silica
fertilizer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13178904.2A
Other languages
German (de)
English (en)
Inventor
Andreas Grulke
Matthias Potthoff
Liliana Kotte
Holger Althues
Stefan Kaskel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Fertilizer Technology GmbH
Original Assignee
Uhde Fertilizer Technology BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Uhde Fertilizer Technology BV filed Critical Uhde Fertilizer Technology BV
Priority to EP13178904.2A priority Critical patent/EP2832439A1/fr
Priority to US14/909,267 priority patent/US20160175797A1/en
Priority to PCT/EP2014/001919 priority patent/WO2015014447A1/fr
Priority to RU2016107227A priority patent/RU2665416C2/ru
Priority to CN201480050095.6A priority patent/CN105531023A/zh
Priority to ARP140102862A priority patent/AR097163A1/es
Publication of EP2832439A1 publication Critical patent/EP2832439A1/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/1872—Details of the fluidised bed reactor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/02—Apparatus characterised by being constructed of material selected for its chemically-resistant properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/16—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
    • B01J8/38—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed containing a rotatable device or being subject to rotation or to a circulatory movement, i.e. leaving a vessel and subsequently re-entering it
    • B01J8/384—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed containing a rotatable device or being subject to rotation or to a circulatory movement, i.e. leaving a vessel and subsequently re-entering it being subject to a circulatory movement only
    • B01J8/388—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed containing a rotatable device or being subject to rotation or to a circulatory movement, i.e. leaving a vessel and subsequently re-entering it being subject to a circulatory movement only externally, i.e. the particles leaving the vessel and subsequently re-entering it
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C9/00—Fertilisers containing urea or urea compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00796—Details of the reactor or of the particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/02—Apparatus characterised by their chemically-resistant properties
    • B01J2219/0204—Apparatus characterised by their chemically-resistant properties comprising coatings on the surfaces in direct contact with the reactive components
    • B01J2219/0209—Apparatus characterised by their chemically-resistant properties comprising coatings on the surfaces in direct contact with the reactive components of glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/02—Apparatus characterised by their chemically-resistant properties
    • B01J2219/0204—Apparatus characterised by their chemically-resistant properties comprising coatings on the surfaces in direct contact with the reactive components
    • B01J2219/0218—Apparatus characterised by their chemically-resistant properties comprising coatings on the surfaces in direct contact with the reactive components of ceramic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/02—Apparatus characterised by their chemically-resistant properties
    • B01J2219/0204—Apparatus characterised by their chemically-resistant properties comprising coatings on the surfaces in direct contact with the reactive components
    • B01J2219/0245—Apparatus characterised by their chemically-resistant properties comprising coatings on the surfaces in direct contact with the reactive components of synthetic organic material

Definitions

  • the invention is related to the area of fertilizers, in particular urea, and concerns a granulation reactor coated with at least one organic silica compound to prevent precipitation of fertilizer deposits, a process for coating hard surfaces, a method for preventing the precipitation of fertilizer deposits on hard surfaces and the use of organic silica compounds as coatings for hard surfaces.
  • Fertilizer is any organic or inorganic material of natural or synthetic origin that is added to a soil to supply one or more plant nutrients essential to the growth of plants. Fertilizers typically provide, in varying proportions, the six major macronutrients phosphor, potassium, calcium, magnesium, sulphur and in particular nitrogen. Sources for nitrogen can be of natural or synthetic origin; however the main nitrogen-containing fertilizers are ammonium salts, like ammonium nitrate, and in particular urea.
  • EP 1 711 447 B1 discloses a method for producing a fertilizing agent containing urea, by means of synthesis step, an evaporation process, and a granulation unit.
  • a self-regulating centrifugal pump is used to reduce the dwell time and to optimise the positioning of the components of the method for transporting the product flow of the evaporation process to the granulation unit.
  • feed solution comprising up to 97 % b.w. urea is dispensed to the injection heads where it is finely atomized up into the bed of moving particles, assisted by air.
  • WO 2012 034650 A1 refers to a method for producing urea granules having low moisture absorption capacity, with a urea granulator, having a granule flow inlet side and oppositely a granule flow outlet side, forming an axis alongside which urea granules from a urea solution and a urea/ammonium salt-stream are formed, whereby the urea solution and the urea-ammonium salt-stream are sprayed as a mixture or separately via a feed system unit via various nozzles into the urea granulator onto a seed material.
  • a major drawback associated with the production of nitrogen-containing fertilizer granules in general and urea granules in particular is the fact that during granulation fertilizers show strong tendency to precipitate.
  • the caking of dust deposits at the inner walls of the reactor leads to the effect that from time to time bigger parts of the deposit crumble from the surface contaminating the fluidized bed with increased amounts of thermal degradation products of urea such as for example biuret and particles with irregular and unwanted size and shape leading to a lower output of granules meeting the given specification. Dust deposits may also block the granulator outlet. As a result the reactor needs to be cooled down, discharged and cleaned in short terms. Obviously, this leads to increased maintenance and operational requirements.
  • the problem underlying the present invention has been to avoid the disadvantages from the state of the art as explained above. More particular it has been the object of the invention to provide a new reactor which avoids or reduces the formation of precipitation and caking products at the inside walls.
  • a first object of the present invention relates to a reactor for producing nitrogen-containing fertilizer granules, wherein the inside walls of said reactor are coated with a layer of at least one organic silica compound.
  • methylpolysiloxanes represent excellent resins for coating various hard surfaces, in particular stainless steel, in order to avoid precipitation of fertilizer particles in general and urea in particular. Coatings having a thickness of few micrometres, which can be easily applied by spraying, lead to significantly less precipitation on the inside walls and extend the periods for discharging and cleaning of the reactors seriously.
  • Another advantage of the specific coating is that the layer remains stable until 150 °C (peak temperature) and is in particular stable under constant operating conditions of about 110 °C.
  • a second object of the invention is related to a process for coating of hard surfaces, wherein a surface selected from steel, stainless steel, aluminium or alloys comprising iron and/or aluminium is treated with at least one methylpolysiloxane.
  • the process might be applied to any suitable hard surface, such as for example steel, stainless steel, aluminium or alloys comprising iron and/or aluminium
  • the preferred embodiment of the present invention deals with the inside metal wall of a reactor.
  • the reactor is a granulator containing a fluidized bed, which is for example useful for making fertilizer granules.
  • the fluidized bed contains small particles acting as nuclei or seeds for the fertilizer, in particular urea.
  • urea solution is sprayed through nozzles.
  • the flow direction of the seeds and the fertilizer droplets are in cross-current.
  • the fertilizer solution typically shows a very low water content of less than 10, preferably less than 5 % b.w. and may contain auxiliary agents such as formaldehyde, urea formaldehyde, aluminium sulphate, magnesium sulphate, micronutrients and other hydrocarbon granulation additives.
  • the seed material needs to be chemically compatible with the produced fertilizer granules.
  • crushed oversized or undersized fertilizer granules which are produced by the process and recycled.
  • the seed material has an optimum size if it is 20 to 80 %, preferably 40 to 80 % and especially 60 to 80 % smaller than the desired end product. Since it is desirous to form fertilizer granules with low moisture content, but high water binding capacity, it is preferred to choose the size of the seed as small as possible, in order to ensure a totally covered material with the fertilizer solution.
  • the reactor includes an additional inlet for a second fertilizer compound, allowing to produce for example fertilizers comprising urea and an ammonium salt.
  • the essence of the invention encompasses the surprising observation that organic silica compounds in general, more particular polysiloxanes and even more preferred methylpoly-siloxanes represent very effective coatings avoiding the precipitation and caking of nitrogen-containing fertilizers, particularly urea during the granulation process in the fluidized bed.
  • Suitable organic silica compounds encompass oligomeric and polymeric hydrides with the radicals of the formulae H(OSiH 2 ) n OH and (OSiH 2 ) n .
  • Polysiloxanes also include branched compounds, the defining feature being that each pair of silicon centres is separated by one oxygen atom.
  • the siloxane functional group forms the backbone of silicones, the premier example of which is polydimethylsiloxane.
  • methylpolysiloxanes in general exhibit excellent properties as coatings for hard surfaces, it is advantageous to select products which are sprayable showing a kinematic viscosity according to DIN 3679 of from about 10 to about 55 mm 2 /s, and preferably from about 20 to about 35 mm 2 /s.
  • methylpolysiloxanes exhibiting flash points above about 60 °C, preferably above 65 °C, and ignition temperatures above 180 °C, preferably above 210 °C to make sure that the coatings remain stable under the process conditions.
  • SILRES ® MSE 100 (Wacker Chemie), representing a methyl ester of a mixture of oligomeric methylsilicates, which are also described as methoxy-functionalized methylpolysiloxane resins.
  • said methylpolysiloxanes may include a polymerisation catalyst, which is typically an alkyl titanium compound, such as for example polydibutyltitanate. Suitable amounts are from about 1 to about 10 % b.w. and preferably from about 5 to about 8 % b.w. - calculated on the organic silica compounds.
  • a polymerisation catalyst typically an alkyl titanium compound, such as for example polydibutyltitanate. Suitable amounts are from about 1 to about 10 % b.w. and preferably from about 5 to about 8 % b.w. - calculated on the organic silica compounds.
  • the organic silica compounds Prior to the application of the organic silica compounds it is advantageous to clean the hard surface, for example by using degreasing agents like isopropyl alcohol and/or commercial cleaners comprising surface-active agents. It is also useful to subject the surface to sand blasting.
  • degreasing agents like isopropyl alcohol and/or commercial cleaners comprising surface-active agents. It is also useful to subject the surface to sand blasting.
  • the coating can be applied to the hard surface by any suitable process, as for example bathing, dipping and in particular spraying. Suitable thicknesses of the coatings range from about 5 to about 100 ⁇ m, and in particular from about 15 to about 25 ⁇ m. Once the coating has been applied to the surface the reactor should be allowed to dry at ambient conditions, such as for example about 20 °C for about one day. It has been particular useful to introduce hot air into the reactor prior to the initial operation
  • Another object of the present invention is related to a method for preventing a hard surface from precipitations of nitrogen-containing fertilizer deposits, in that said surface is coated with at least one organic silica compound and preferably a methylpolysiloxane.
  • said hard surface is the inside wall of a urea granulator and the fertilizer is urea.
  • the present invention also encompasses the use of at least one organic silica compound and preferably a methylpolysiloxane as a coating for hard surfaces against precipitation of nitrogen-containing fertilizer deposits.
  • Figure 1 shows equipment for granulation in a fluidized bed.
  • the granulator 1 consists of a first feed 2 from which a first urea solution is distributed to spray nozzles 3 inside of the granulator.
  • the urea solution is sprayed on solid urea particles which are introduced into the granulator via the granule inlet side 4 and forming a fluidized bed inside the granulator.
  • the granules thus obtained are leaving the granulator via the granule outlet side 5 and are subjected to a first cooler 6 and subsequently to sieving fraction 7, where granules having higher or lower average diameters - optionally after passing a crusher 8 - are returned to the flow inlet side 4, while granules within the specified particle range are separated off passing a second cooler 9 as the desired end product.
  • the inside walls of the same granulator were defatted, cleaned and sandblasted as described above. Subsequently, the plates were coated using a mixture of a methylpolysiloxane resin (Silers ® MSE 100, Wacker Chemie) and a polydibutyltitanate (Tyzor ® BTP) in a ratio by weight of 93:7 forming a film showing a thickness of on average 0.13 ⁇ m.
  • the granulator was allowed to dry for 24 hours. Then the granulation process was conducted for 2, 17 and 35 days respectively and after each period the walls were inspected in order to determine the amount of precipitation.
  • Table 1 Precipitation on granulator inside walls Examples Precipitation After 2 days After 17 days After 35 days Example C1 First particles formed Significant Strong, cleaning required Example 1 None None Very few particles formed

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fertilizers (AREA)
  • Catalysts (AREA)
EP13178904.2A 2013-08-01 2013-08-01 Réacteur pour la production des granulés d'engrais contenant d'azote Withdrawn EP2832439A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP13178904.2A EP2832439A1 (fr) 2013-08-01 2013-08-01 Réacteur pour la production des granulés d'engrais contenant d'azote
US14/909,267 US20160175797A1 (en) 2013-08-01 2014-07-12 Reactor for producing nitrogen-containing fertilizer granules
PCT/EP2014/001919 WO2015014447A1 (fr) 2013-08-01 2014-07-12 Réacteur de production de granulés de fertilisant contenant de l'azote
RU2016107227A RU2665416C2 (ru) 2013-08-01 2014-07-12 Реактор для производства гранул азотсодержащего удобрения
CN201480050095.6A CN105531023A (zh) 2013-08-01 2014-07-12 用于制备含氮肥料颗粒的反应器
ARP140102862A AR097163A1 (es) 2013-08-01 2014-07-31 Reactor para producción de gránulos de fertilizantes nitrogenados y proceso de recubrimiento de superficies duras

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13178904.2A EP2832439A1 (fr) 2013-08-01 2013-08-01 Réacteur pour la production des granulés d'engrais contenant d'azote

Publications (1)

Publication Number Publication Date
EP2832439A1 true EP2832439A1 (fr) 2015-02-04

Family

ID=48917385

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13178904.2A Withdrawn EP2832439A1 (fr) 2013-08-01 2013-08-01 Réacteur pour la production des granulés d'engrais contenant d'azote

Country Status (6)

Country Link
US (1) US20160175797A1 (fr)
EP (1) EP2832439A1 (fr)
CN (1) CN105531023A (fr)
AR (1) AR097163A1 (fr)
RU (1) RU2665416C2 (fr)
WO (1) WO2015014447A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3542893A1 (fr) 2018-03-23 2019-09-25 thyssenkrupp Fertilizer Technology GmbH Granulateur à lit fluidisé courante ou refroidisseur à lit fluidisé pourvus de plaque perforée revêtue
WO2019180155A1 (fr) 2018-03-23 2019-09-26 Thyssenkrupp Fertilizer Technology Gmbh Système de granulateur à lit fluidisé avec matériau de revêtement pour empêcher l'accumulation de poussière dans les systèmes d'air des installations de granulation d'urée
WO2021083541A1 (fr) 2019-10-31 2021-05-06 Thyssenkrupp Fertilizer Technology Gmbh Granulateur de lit fluidisé

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10011536B1 (en) * 2017-09-20 2018-07-03 King Saud University Encapsulated sustained release urea fertilizer
EP3550000A1 (fr) 2018-04-04 2019-10-09 Global Bioenergies Composition d'essence permettant de réduire les émissions de particules
JP7402714B2 (ja) 2020-03-05 2023-12-21 東洋エンジニアリング株式会社 流動床型造粒装置または流動床／噴流床型造粒装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3192256A (en) * 1960-02-04 1965-06-29 Celanese Corp Process for making peracids by the oxidation of aldehydes
GB1395906A (en) * 1971-05-08 1975-05-29 Fisons Ltd Prilling
DD118287A1 (fr) * 1975-02-14 1976-02-20
US4019890A (en) * 1973-12-28 1977-04-26 Chissoasahi Fertilizer Co., Ltd. Method for producing coated fertilizer
US5264603A (en) * 1992-08-25 1993-11-23 Dow Corning Corporation Polydimethylsiloxanes for modulus reduction and method for their preparation

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071804A (en) * 1960-07-15 1963-01-08 Phillips Petroleum Co Prilling tower and process
US3372019A (en) 1964-09-28 1968-03-05 Chevron Res Slow-release coating composition consiting of wax and ethylene vinylacetate
NL8700913A (nl) 1987-04-16 1988-11-16 Nl Stikstof Werkwijze voor het vervaardigen van kunstmestgranules.
JP4727017B2 (ja) * 1999-11-15 2011-07-20 東レ・ダウコーニング株式会社 熱伝導性シリコーンゴム組成物
DE102004005907B4 (de) * 2004-02-05 2006-01-05 Uhde Gmbh Anlage zur Herstellung von biuretarmem harnstoffhaltigem Düngemittelgranulat
EP2431346A1 (fr) 2010-09-15 2012-03-21 Uhde Fertilizer Technology B.V. Procédé de production d'engrais d'urée avec des faibles tendances d'absorption d'humidité

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3192256A (en) * 1960-02-04 1965-06-29 Celanese Corp Process for making peracids by the oxidation of aldehydes
GB1395906A (en) * 1971-05-08 1975-05-29 Fisons Ltd Prilling
US4019890A (en) * 1973-12-28 1977-04-26 Chissoasahi Fertilizer Co., Ltd. Method for producing coated fertilizer
DD118287A1 (fr) * 1975-02-14 1976-02-20
US5264603A (en) * 1992-08-25 1993-11-23 Dow Corning Corporation Polydimethylsiloxanes for modulus reduction and method for their preparation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3542893A1 (fr) 2018-03-23 2019-09-25 thyssenkrupp Fertilizer Technology GmbH Granulateur à lit fluidisé courante ou refroidisseur à lit fluidisé pourvus de plaque perforée revêtue
WO2019180158A1 (fr) 2018-03-23 2019-09-26 Thyssenkrupp Fertilizer Technology Gmbh Granulateur à lit fluidisé ou refroidisseur à lit fluidisé comprenant une plaque perforée revêtue
WO2019180155A1 (fr) 2018-03-23 2019-09-26 Thyssenkrupp Fertilizer Technology Gmbh Système de granulateur à lit fluidisé avec matériau de revêtement pour empêcher l'accumulation de poussière dans les systèmes d'air des installations de granulation d'urée
WO2021083541A1 (fr) 2019-10-31 2021-05-06 Thyssenkrupp Fertilizer Technology Gmbh Granulateur de lit fluidisé

Also Published As

Publication number Publication date
US20160175797A1 (en) 2016-06-23
RU2665416C2 (ru) 2018-08-29
RU2016107227A (ru) 2017-09-04
AR097163A1 (es) 2016-02-24
CN105531023A (zh) 2016-04-27
RU2016107227A3 (fr) 2018-03-19
WO2015014447A1 (fr) 2015-02-05

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